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Ecological Intelligence

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Ecological Intelligence / Subject

Community ecology

Peer-reviewed Asia

Plants and mycorrhizal fungi responded differently to rainfall change—but their spatial variability converged under drought

Evidence
Peer-reviewed
Geography
Inner Mongolia, China
System
Temperate grassland

WHAT THE EVIDENCE SAYS

A field experiment compared ambient precipitation with 50% reductions and increases. Plant and arbuscular-mycorrhizal-fungal diversity responded differently, but their spatial compositional variability converged under reduced precipitation; AMF variation was driven primarily by abiotic soil filtering.

WHY IT MATTERS / OUR READ

Aboveground and belowground diversity do not have to move together even when drought reorganizes both communities. That complicates attempts to infer soil symbiont response from vegetation monitoring alone.

CAVEATS / UNCERTAINTY

The experiment represents one temperate-grassland system and a defined precipitation manipulation. Community-level sequencing and spatial-variability metrics do not directly establish changes in ecosystem function.

SOURCE

Journal of Plant Ecology — accepted precipitation experiment
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An Inner Mongolia precipitation experiment found plant and AMF diversity moving differently while reduced rainfall pushed both communities toward similar patterns of spatial compositional variability.

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Peer-reviewed Global

Diversity in dispersal strategies can buffer competitive-exclusion risk

Evidence
Peer-reviewed
Geography
Global framework; forest validation datasets
System
Ecological communities / forests

WHAT THE EVIDENCE SAYS

The study develops a competitive-balance metric that incorporates abundance, diversity of dispersal strategies and interspecific interactions. For a given abundance, greater heterogeneity in dispersal strategies reduced modeled vulnerability to competitive exclusion, and the framework was evaluated with tropical and temperate forest data.

WHY IT MATTERS / OUR READ

Connectivity is not just the amount of movement. Diversity in how species move can itself contribute to coexistence, which may matter when corridors, fragmentation or restoration simplify movement opportunities.

CAVEATS / UNCERTAINTY

The core result is theoretical and has so far been validated mainly against forest datasets. Its usefulness across other taxa, disturbance regimes and managed landscapes remains to be tested.

SOURCE

Nature Ecology & Evolution — primary theory and validation study
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A new framework combines abundance, dispersal diversity and competition to estimate local-extinction vulnerability; forest data suggest heterogeneous dispersal strategies can reduce exclusion risk.

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Europe

One estuary can organize twelve taxonomic groups along the same gradient without making them respond the same way

Evidence
Peer-reviewed multi-taxon estuarine field study
Geography
Elbe Estuary, Germany
System
Estuary / salt marsh / river

WHAT THE EVIDENCE SAYS

The study analyzed alpha- and beta-diversity across 12 groups of microbes, plants and animals spanning marsh and river habitats. Salinity was a major environmental axis across land and water; flooding frequency mattered in marshes and suspended particulate matter in the river. Community composition changed strongly along the estuarine gradient across most taxa, while alpha-diversity responses were more taxon-specific.

WHY IT MATTERS / OUR READ

Ecotones are organized by gradients, not by a single habitat label. As freshwater inflow, sea level or salinity regimes shift, managers should expect community turnover to move unevenly across taxa and across the land–water boundary.

CAVEATS / UNCERTAINTY

This is one large European estuary and an observational snapshot of multiple taxa. Salinity is an organizing axis, not the only driver, and taxonomic groups differed in which environmental variables best explained their diversity.

SOURCE

Estuarine, Coastal and Shelf Science — primary study
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Across marsh and river habitats of the Elbe Estuary, salinity was the most consistent axis of community turnover, while alpha-diversity responses varied among taxa.

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Peer-reviewed Global

More coral does not fully rescue fish richness when algae also gains ground

Evidence
Peer-reviewed
Geography
Global coral-reef dataset
System
Coral reefs

WHAT THE EVIDENCE SAYS

Using a global reef dataset spanning 2006–2023, researchers tested how low-lying algae and macroalgae altered the relationship between live hard-coral cover and fish species richness. Both algal groups weakened the positive coral–fish richness relationship. Low-lying-algae effects were evident where coral cover was below about 45%, while macroalgal effects persisted until roughly 65% coral cover. Sensitivity also varied with fish diet and body size.

WHY IT MATTERS / OUR READ

Coral cover is not a sufficient condition metric by itself. Two reefs with similar coral cover can carry different fish-diversity prospects if algal state and functional composition differ.

CAVEATS / UNCERTAINTY

The reported coral-cover values are statistical context thresholds from an observational global dataset, not universal management trigger points. Species richness does not capture abundance, biomass or ecosystem function, and associations do not establish that reducing algae alone would restore fish richness.

SOURCE

Conservation Biology — primary study
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A global 2006–2023 dataset found low-lying algae weakened the coral-cover relationship below about 45% coral cover, while macroalgal effects persisted to about 65%.

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Peer-reviewed Latin America & Caribbean

Hummingbirds and nectar plants reorganized together across a Mexican mountain—mostly through turnover

Evidence
Peer-reviewed
Geography
Sierra Madre del Sur, Mexico
System
Montane hummingbird–plant communities

WHAT THE EVIDENCE SAYS

Surveys across five elevational bands in Mexico’s Sierra Madre del Sur compared hummingbird and nectar-plant alpha and beta diversity. Richness and diversity varied across elevation, with strong compositional turnover between the ends of the gradient. Plant richness and flower abundance were important correlates of hummingbird diversity, highlighting how the animal pattern was coupled to the distribution of floral resources rather than elevation alone.

WHY IT MATTERS / OUR READ

Mountain biodiversity planning benefits from tracking interaction resources as well as focal species. Protecting a continuous elevational gradient without maintaining the flowering community can preserve geography while losing part of the mechanism.

CAVEATS / UNCERTAINTY

This is an observational elevational study rather than an experiment; elevation covaries with climate, vegetation and land use. Survey timing and flowering phenology influence the observed network, and the results should not be converted into fixed elevational prescriptions for other mountains.

SOURCE

Biotropica — primary study
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Five elevation bands in the Sierra Madre del Sur showed strong changes in both hummingbird and nectar-plant composition; local flower resources helped explain hummingbird diversity.

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Peer-reviewed Latin America & Caribbean

As elevation rose in Costa Rica, dung-beetle diversity and dung removal fell together

Evidence
Peer-reviewed
Geography
Talamanca mountain range, Costa Rica
System
Tropical montane forest

WHAT THE EVIDENCE SAYS

Field sampling across 10 sites spanning roughly 440–3,200 m in Costa Rica’s Talamanca range found strong elevational turnover in dung-beetle assemblages. Abundance, species richness and functional diversity declined with elevation, and measured dung-removal rates declined in parallel, connecting taxonomic and functional reorganization with decomposition-related ecosystem function.

WHY IT MATTERS / OUR READ

The useful signal is that biodiversity change and ecosystem process can move together along climate gradients—but the functional pathway is carried by community composition and traits, not simply species count.

CAVEATS / UNCERTAINTY

Elevation bundles temperature, moisture, vegetation, resource supply and other environmental changes, so this observational gradient cannot isolate a single cause. Dung-removal assays measure one function over a bounded period and may not represent all decomposition or nutrient-cycling outcomes.

SOURCE

Biotropica — primary study
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Across a tropical mountain gradient, beetle abundance, richness, functional diversity and dung removal all declined with elevation, linking community change to an ecosystem process.

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Peer-reviewed Global

Predators can learn a novel prey—and that learning can reverse who wins indirect competition

Evidence
Peer-reviewed
Geography
Theoretical / globally applicable
System
Predator–prey communities

WHAT THE EVIDENCE SAYS

A one-predator/two-prey model shows that novel prey can gain a temporary refuge from naïve predators and become the stronger apparent competitor. Faster social learning erodes that refuge and can permit coexistence; under cycling dynamics, the same mechanism can even generate apparent mutualism or apparent predation.

WHY IT MATTERS / OUR READ

Social learning is not just individual behavior in this model; it changes community-level outcomes. That makes predator experience a plausible missing state variable when managers interpret invasion or prey-switching dynamics.

CAVEATS / UNCERTAINTY

This is theory, not a field test. Outcomes depend on model structure and learning assumptions and should generate empirical hypotheses rather than be treated as a management prescription.

SOURCE

Ecology
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EvidencePeer-reviewedGeographyTheoretical / globally applicableSystemPredator–prey communities WHAT THE EVIDENCE SAYS A one-predator/two-prey model shows that novel prey can gain a temporary refuge from naïve predators and become

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Peer-reviewed Africa

One invasive fish can suppress another—and leave a native remnant in the middle

Evidence
Peer-reviewed
Geography
Breede River, Western Cape, South Africa
System
River fish community

WHAT THE EVIDENCE SAYS

A river survey recorded 2,546 fish representing 17 species, seven of them introduced. Sharptooth catfish frequency was negatively associated with fish diversity, while invasive black bass showed the opposite broad association; flow barriers, high catfish abundance and turbidity appeared to suppress visually hunting bass enough for endangered Berg-Breede whitefish to persist at very low frequency.

WHY IT MATTERS / OUR READ

In invaded systems, management can face interacting pressures rather than one clean native-versus-invasive axis. Removing one stressor can change the effect of another, which makes food-web and barrier context relevant to control decisions.

CAVEATS / UNCERTAINTY

The whitefish remnant is persistence, not recovery. The evidence is observational and site-specific, and antagonism among invasive fishes is not an argument to retain invasive species or barriers; intervention effects would need direct testing.

SOURCE

Biological Invasions
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In South Africa’s Breede River, flow barriers, turbidity and abundant sharptooth catfish appear to damp black-bass predation enough for an endangered whitefish to persist at extremely low frequency.

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Peer-reviewed Latin America & Caribbean

More macrophyte litter changed carbon processing without speeding litter disappearance

Evidence
Peer-reviewed
Geography
Cabiúnas Lagoon, Rio de Janeiro State, Brazil
System
Macrophyte-dominated shallow lake and wetland detrital food webs

WHAT THE EVIDENCE SAYS

A 48-day experiment tested all possible one-, two-, four- and six-species mixtures drawn from eight aquatic macrophytes. Increasing litter richness reduced cumulative microbial respiration and increased metabolic efficiency without changing dry-weight loss, while species composition and chemical diversity helped explain non-additive responses.

WHY IT MATTERS / OUR READ

Decomposition metrics are not interchangeable. The same amount of litter can disappear while carbon is partitioned differently between respiration and retained organic matter, so mass loss alone can miss a change in ecosystem carbon processing.

CAVEATS / UNCERTAINTY

This was a controlled microcosm experiment using standardized, ground litter and lagoon water rather than intact field detritus. Several species required non-senescent leaves, and 48-day microbial responses do not establish whole-ecosystem carbon balance.

SOURCE

Aquatic Ecology
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In 410 Brazilian lagoon microcosms, litter richness reduced microbial respiration but did not change dry-mass loss, while species identity still mattered.

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Peer-reviewed Europe

For Europe’s salamander fungus, diversity and density are telling different stories

Evidence
Peer-reviewed
Geography
Germany and Spain
System
Amphibian communities exposed to Batrachochytrium salamandrivorans

WHAT THE EVIDENCE SAYS

A multi-site synthesis assembled 2,625 amphibians from Bsal-positive locations spanning 14 species. Across infected communities, Bsal prevalence was negatively associated with host-species richness and positively associated with total amphibian abundance. In fire salamanders alone, abundance instead tracked lower prevalence, a pattern the authors interpret cautiously because disease-caused mortality can itself lower host density.

WHY IT MATTERS / OUR READ

Disease ecology can invert the meaning of a familiar metric. Richness may be associated with lower pathogen prevalence, but abundance can be both a driver and a consequence of disease; management should avoid translating a cross-site 'dilution' pattern into a simple diversity prescription without resolving mechanism.

CAVEATS / UNCERTAINTY

The analysis compiles heterogeneous observational datasets and is dominated by German sites. The fire-salamander richness-by-density interaction was not statistically significant, and infected-site sampling, life stage and mortality can bias apparent prevalence relationships. This does not demonstrate a diversity intervention that controls Bsal.

SOURCE

Journal of Applied Ecology
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Across Bsal-positive European sites, infection prevalence fell as amphibian richness rose, while fire salamanders showed a reversed density relationship consistent with disease-driven population loss.

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Peer-reviewed Europe

Germany’s bird communities are shifting toward warm-affinity species—but they are lagging behind the climate

Evidence
Peer-reviewed
Geography
Germany
System
Common bird communities under climate warming

WHAT THE EVIDENCE SAYS

Using structured German Common Bird Monitoring data from 2005–2024, a Journal of Biogeography study found that more than 57% of analyzed communities shifted toward species associated with warmer conditions. Median community thermophilisation was about 0.003°C per year and lagged behind local temperature increases, with ecological, life-history and demographic filters influencing the pace of turnover.

WHY IT MATTERS / OUR READ

Community response is not simply climate velocity translated into species turnover. Lags can create communities that are increasingly mismatched with contemporary conditions, and the species that can disperse, reproduce or exploit altered habitats fastest may disproportionately shape future assemblages.

CAVEATS / UNCERTAINTY

Thermophilisation is a community-composition index, not a direct measure of ecosystem health. The study documents association and lag over two decades; it does not imply that warm-affinity replacements compensate functionally for declining cold-affinity species.

SOURCE

Journal of Biogeography
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Countrywide monitoring from 2005–2024 found thermophilisation in 57% of communities, with ecological filters slowing compositional change relative to local warming.

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